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Reasons Your Fiat 500 Key Fob Won't Work


A Fiat 500 key fob makes it easy to open doors and start your car. There are a variety of reasons why the fob could stop working. This could be due to a dead coin battery or damage to the receiver module, water issues, and interfering.

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Dead Coin Battery

The most common reason your 500 key fob won't function is the battery is dead. Modern key fobs have an operating range that is limited and must be within a few inches of the vehicle to work. If you are further away from your car and hit the keyfob, it will not respond and display the message "Key Fob Not Detected".

If this happens, replace the battery in the coin cell (Part number CR2032) with a fresh one from a reputable brand such as Panasonic, Duracell, or Energizer. You can find them in the local hardware store or online.

You can test the coin-cell battery by pressing the buttons while you are standing close to your Fiat 500. The car should blink its parking lights, and the key fob should operate the lock and unlock switches.

If your key fob still doesn't work even after replacing the battery, there may be water damage which hinders it from communicating with the module inside your vehicle. Water damage can occur in a number of ways, ranging from an accidental splash to submerging your fob in salt water at the beach. If you suspect your fob has been exposed to water, put it in a dry rice bag to pull the moisture back out. If this doesn't work the fob might need to be reset by an experienced auto locksmith or by the dealer.

Water Damage

Water damage can occur when you submerge the fob in the ocean or wash it in a washing machine. Saltwater is especially dangerous to the circuit board of the fob that can cause it to short out and eventually end up dying. The fob getting wet is not a good idea but if you accidentally drop it in a glass of water or do not remember to remove it from your pants pocket prior to running the washer do not give up hope.

First, remove the battery from the fob. Clean the electronic chip using isopropyl alcohol or another similar product and dry it thoroughly before replacing the battery. Next check the fob to test if it works. If the fob doesn't work it could need to be reprogrammed. This is typically done by a professional or dealer auto locksmith.

If the key you have is older and is not programmed to work with your vehicle then you'll need to replace it completely. A professional automotive locksmith can complete this simple process. The locksmith will need the key to be cut to match your car's ignition. They'll also need to reprogram the fob in the system of your car. It's a simple and cost-effective process that can usually be completed on the same day.

Receiver Module Issues

The 500 key fob you have may not function because it's out of range. The remote typically has an operating range of 30 feet or less and if it's far from your vehicle, it won't respond to your commands. You can easily solve this issue by moving the remote closer to your car until it responds.

If your fob does not work after you replace the battery for the coin, also called a "button", "watch" or "button" It could be a problem with the circuit board inside. In the majority of cases, reprogramming your fob can resolve the issue. You can find instructions on how to do this for the majority of vehicles by searching YouTube or reading the owner's manual.

It could be necessary to replace the metal clips that hold the coin batteries in place. If they become loose, it could prevent your coin battery from sitting properly, causing your remote to malfunction.

In rare cases the fob might be out of alignment with your vehicle because of hardware or software issues. This could be a huge headache, but you can often fix this by visiting a local dealer or auto locksmith to reprogram your fob for you. In some instances, they may need to install the software again in your body control module as well.

Interference

In addition to a dead battery on a coin, the key fob may not be able to receive or transmit an signal due to interference. This could occur if the keyfob's location is in close proximity to a radio transmitter, like a cell phone or radar detector. Other reasons why the key fob might not function could be due to a weak connection to the buttons, damage to the internal chip or water damage.

If the key fob stopped working one day in the middle of the night or after trying every option at home to solve it e.g. replacing the battery, reprogramming it and using the spare key fob, you could have a damaged receiver module on your 500. The receiver module, which is located under the dashboard, is able to pick up radio frequency signals from your key fob. Then, it converts them into electronic commands that the vehicle interprets.

Fortunately, there's an easy way to reset all on-board systems in your 500 device, including the key fob. Disconnect the battery for 15 minutes by taking off first the negative cable and then the positive cable. Reconnect the battery. This will clear any residual electricity, and allow you to restart the computer of your car. This will help you get your key fob working again. If the issue continues, you should seek out an expert technician. They can identify the exact cause of any issues.

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